External respiration or breathing is a process of inhaling the air into the lungs and expelling the air that contains more carbon-di-oxide from the lungs to the outer environment. Exchange of gases in and out of the blood also takes place simultaneously.
Two paired sheets of muscle from the ribs to the pelvis that flex you forward. Transversus Abdominis. The deepest ab muscle, which wraps around the waist to support the spine. Think of your ab muscles as the meat in the middle of a fat sandwich.On top of them is subcutaneous fat, the stuff you pinch as you look in the mirror.he answer includes factors like body type, fat composition, and possibly even the shape of the pelvic bone, where your ab muscles attach, she says. Theoretically, a wider pelvis can translate into a broad lower abdomen and hips, compared with what's north of the belly button.
You know you're supposed to work your core. Strong ab, back, hip, and glute muscles generate power and guard against injuries. But it can be easy to skip good-for-you planks after a run, when a hot shower or yummy brunch awaits.orks: The transversus abdominis (deep core muscles) and the rectus abdominis (a.k.a. six-pack muscles). To Do: Stand tall. Inhale, lift your arms overhead (a), and arch into a slight back bend (b). Exhale and use your abs to straighten up again, aligning your shoulders over your hips.